The great weight of the ship may indeed prevent her from acquiring her greatest velocity; but when she has attained it, she will advance by her own intrinsic motion, without gaining any new degree of velocity, or lessening what she has acquired.
Audiences are always better pleased with a smart retort, some joke or epigram, than with any amount of reasoning.
Well, the whole story is in the book, but the short answer is that I was the first information architect in an organization that was traditionally design-oriented, and I felt I needed a tool to help me gain the trust and support of my colleagues.